<template>
    <div class="person">
      <h1>情况一：监视【ref】定义的【基本类型】数据</h1>
      <h2>当前求和为：{{ sum }}</h2>
      <button @click="changeSum">点我sum+1</button>
    </div>
</template>

<script setup name="Person">
    import {ref, watch} from "vue";

    let sum = ref(0)


    function changeSum() {
      sum.value += 1;
    }

    const stopWatch = watch(sum, (newValue, oldValue) => {
      console.log('sum变化了', newValue, oldValue)
      if(newValue >= 10) {
        stopWatch();
      }
    })
</script>

<style scoped>
    .person {
        background-color: skyblue;
        box-shadow: 0 0 10px;
        border-radius: 10px;
    }

    button {
        margin: 0 5px;
    }
</style>